<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Service_Amazon
 * @subpackage Ec2
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Availabilityzones.php 16971 2009-07-22 18:05:45Z mikaelkael $
 */

require_once 'Zend/Service/Amazon/Ec2/Abstract.php';

/**
 * An Amazon EC2 interface to query which Availibity Zones your account has access to.
 *
 * @category   Zend
 * @package    Zend_Service_Amazon
 * @subpackage Ec2
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Service_Amazon_Ec2_Availabilityzones extends Zend_Service_Amazon_Ec2_Abstract
{
	/**
	 * Describes availability zones that are currently available to the account
	 * and their states.
	 *
	 * @param string|array $zoneName            Name of an availability zone.
	 * @return array                            An array that contains all the return items.  Keys: zoneName and zoneState.
	 */
	public function describe($zoneName = null)
	{
		$params = array();
		$params['Action'] = 'DescribeAvailabilityZones';

		if(is_array($zoneName) && !empty($zoneName)) {
			foreach($zoneName as $k=>$name) {
				$params['ZoneName.' . ($k+1)] = $name;
			}
		} elseif($zoneName) {
			$params['ZoneName.1'] = $zoneName;
		}

		$response = $this->sendRequest($params);

		$xpath  = $response->getXPath();
		$nodes  = $xpath->query('//ec2:item');

		$return = array();
		foreach ($nodes as $k => $node) {
			$item = array();
			$item['zoneName']   = $xpath->evaluate('string(ec2:zoneName/text())', $node);
			$item['zoneState']  = $xpath->evaluate('string(ec2:zoneState/text())', $node);

			$return[] = $item;
			unset($item);
		}

		return $return;
	}
}
